The holy spirit is biblically defined as potential or kinetic power or energy.
The word power has been used to mean many things over the centuries.
i.e.
Governmental power (emperors, rulers, kings, despots, etc.)
Electrical power
Spiritual power
So the quandary in understanding the holy spirit is wondering if it is a he, she, person, ghost, the wind, a cloud, God, Gabriel or a whole host of other considerations. In studying what the holy spirit is it will serve one to look in the places of the Bible where the holy spirit's character or persona are CLEARLY identified.
Well I can help your search a bit because I have already spent years studying this field the (holy spirit). I have also had years to formulate my own ideas and to visualize the truths in detail. This is why I may seem like I speak in riddles, because I have learned some eloquence (not sure how) with the whole subject and sometimes it is easier to tell a story and then ask you to give me your answer and your answer will reveal the answer to why I think the way I do.
We are a vessel and God supplies the waters that fill our souls to their capacity so that they over flow and spill out into the world.
These waters flow out of the heavens through a portal opened by Christ Jesus. They flow through his body and when we connect to this fountain we are filled with the waters of life.
Many theists do not realize that it was not God that caused the flood it was the devil that opened the heavens and cause the great destruction the Bible records. Through the spirit we learn that the flood was not physical water but the Bible is figuratively talking about paganism which leads to self worship.
But it is God today who pours out a blessing to counter the false God's the flood that cause such abominations to occur.
As I have studied the Bible I have noticed these actionary and reactionary legalistic interactions between the true God and the false God. The god of this world and the one true God have both poured out their spirits within the hearts of their own progeny.
But by nature people gather and hoard to make their own vessels out of broken pottery and they forsake God's fountain of unlimited waters for their own limited sources that more often than not is dry in the parched harsh seasons of life's common trials and tribulations.
The holy spirit is the power of life.
It is erroneously translated ghost. It is attributed personal pronouns when it in actuality is an it. Is electricity alive as a conscious entity? No, but "it" is still a commodity, it is still a thing. Theists have it confused with the inner person of the mind.
The "inner person" of the believers mind is only a conduit for the spirit of God for the inner person is also created in the image of God.
So many of the theist's interpretations of the spirit are so far from the actual character and essence of the spirit that it is downright misleading.
But simply God [PBUH] fathers a seed within us (by the deeds of this son Christ Jesus [pbuh]) and the spirit is the energy used as the seed grows. Once implanted it can never be removed. For seed is permanent just as physical seed with your earthly father is permanent. Once you are born you will always be of your father's seed. (reproduction is not always an easy subject to grapple but it is one of our most innately understood traits by nature)
This "seed" can sit within a person and not grow or it can be nurtured spiritually. Perfect prayer builds the spirit.
Selflessness and patience are notable fruits of the spirit.
People want proof. Well watch a person who find the (often misdirected) liberty and love of God and see if their life does not evidence the fruit of the spirit. A tangible result that is measurable by over a thousand percent. The rate of observable spiritual growth is accelerated to the speed of light and we are propelled into the heavens each conquering time and space.
This is the spirit. The spirit is a gift, it is a one way ticket into the cosmos. This is why this seed embodies spiritual life. It is created and filled to overflowing with the spiritual waters. This is the heavenly power source from God.
So we can sit and be still or we can move as all life tends to do. If we move our spirit grows and we learn to operate it. If it stands still then all we are doing is honking the horn.
Spirit is power and power is energy. Energy is what makes a current move along a wire. This wire stretches up along the phone lines and connects directly to God. To God's internet, and you need a different dot com to be a citizen.
But energy can either be contained like in a battery or it can become kinetic and fulfill its purpose it was designed for.
So in the most rudimentary form, the spirit God creates within us is a heavenly body that is sustained by spirit. Then we by the free will of our own minds operate the body and are filled by the spirit in the mind and world that surrounds us. This person is new and it is a virtual person that once recognized is actually who we really are. We transfer our soul to this spiritual body and we become part of another network.
We are carried along this network by our new bodies (the body of Christ Jesus) and it is the energy of the spirit (the faith of Jesus Christ) in manifestation that propels us at the speed of light so we shine to the world as lights of God's resplendent image and omnipotent power. From glory to glory world without end.
Romans 9:1
I say the truth in Christ, I lie not, my conscience also bearing me
witness in the Holy Ghost [Spirit]
Comment: This is the way I have formulated my own understanding (thought the Bible) of the spirit (in layman's terms) yet in a critical way. If anyone sees any contradiction I am certainly open for discussion.
It is like how light can be both a particle and a wave, because it is physical life mimicking spiritual life.
Peace with God.